连结AE
∵DE⊥平分AB
∴AE = EB
∴∠B = ∠EAB
∴∠AEC = ∠B + ∠EAB = 2∠B = 30°
∵∠C = 90°
∴在Rt△ACE中, AC = AE/2(直角三角形中,30°所对的边是斜边的一半)
∴AC = EB/2
即EB = 2AC
连结AE
∵DE⊥平分AB
∴AE = EB
∴∠B = ∠EAB
∴∠AEC = ∠B + ∠EAB = 2∠B = 30°
∵∠C = 90°
∴在Rt△ACE中, AC = AE/2(直角三角形中,30°所对的边是斜边的一半)
∴AC = EB/2
即EB = 2AC